"The MTA maintains that it retains all information securely with triple DES encryption and that such data is never decrypted. " https://csrc.nist.gov/News/2017

"The MTA maintains that it retains all information securely with triple DES encryption and that such data is never decrypted. " https://csrc.nist.gov/News/2017/Update-to-Current-Use-and-Deprecation-of-TDEA https://csrc.nist.gov/News/2017/Update-to-Current-Use-and-De... As of 2019 NIST has recommended getting off of 3DES